The use of this awkwardly formed term is discouraged. It is synonymous with 'intermolecular rearrangement'.
See: molecular rearrangement
Source:
PAC, 1994, 66, 1077. 'Glossary of terms used in physical organic chemistry (IUPAC Recommendations 1994)' on page 1154 (https://doi.org/10.1351/pac199466051077)